首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   2120篇
  免费   55篇
  国内免费   2篇
儿科学   23篇
妇产科学   1084篇
基础医学   60篇
口腔科学   2篇
临床医学   163篇
内科学   36篇
皮肤病学   6篇
神经病学   7篇
特种医学   15篇
外科学   103篇
综合类   321篇
预防医学   185篇
眼科学   1篇
药学   111篇
  8篇
中国医学   27篇
肿瘤学   25篇
  2024年   2篇
  2023年   22篇
  2022年   37篇
  2021年   56篇
  2020年   48篇
  2019年   215篇
  2018年   118篇
  2017年   73篇
  2016年   31篇
  2015年   41篇
  2014年   105篇
  2013年   101篇
  2012年   97篇
  2011年   82篇
  2010年   71篇
  2009年   53篇
  2008年   39篇
  2007年   39篇
  2006年   48篇
  2005年   25篇
  2004年   39篇
  2003年   12篇
  2002年   8篇
  2001年   4篇
  2000年   9篇
  1999年   5篇
  1998年   1篇
  1997年   3篇
  1995年   3篇
  1994年   4篇
  1993年   1篇
  1992年   3篇
  1991年   1篇
  1990年   1篇
  1988年   3篇
  1987年   1篇
  1986年   1篇
  1985年   32篇
  1984年   280篇
  1983年   50篇
  1982年   72篇
  1981年   58篇
  1980年   63篇
  1979年   53篇
  1978年   37篇
  1977年   27篇
  1976年   36篇
  1975年   26篇
  1974年   19篇
  1973年   22篇
排序方式: 共有2177条查询结果,搜索用时 15 毫秒
41.
腹式与阴式子宫切除术临床疗效比较   总被引:1,自引:0,他引:1  
薛德琼 《中外医疗》2010,29(11):27-28
目的比较腹式子宫切除术与阴式子宫切除术2种手术方法的临床疗效。方法选择我院2007年1月至2009年12月48例阴式子宫切除术患者(阴式组),同时随机抽取腹式子宫切除术48例腹式组,对2组患者手术时间、术中出血量、术后排气时间、术后切口感染例数、住院时间进行比较。结果阴式组的手术时间、术中出血量、术后排气时间、术后感染例数、术后并发症、术后疼痛评分、住院时间都明显少于腹式组.差异具有统计学意义(P〈0.01)。结论阴式子宫切除术具有对患者损伤小、腹部无瘢痕、术后恢复快,并发症少、住院时间短等优点。  相似文献   
42.
The results of a chromosomal test by genetic amniocentesis in 58 cases with an increased nuchal translucency (NT; > or =3 mm thickness) revealed 47 cases showing a normal karyotype (81%) and 11 cases (19%) showing an abnormal karyotype. However, the cases of a normal karyotype with increased NT also included those with fetal abnormalities. Among the 49 cases in which NT was observed during the first trimester and then subsequently disappeared, chromosomal abnormalities were observed in five, and fetal abnormalities other than chromosomal abnormalities were observed in two. Meanwhile, all nine cases in which an increased NT remained or in which NT continued to increase in size during the second trimester were diagnosed as having cystic hygroma, and chromosomal abnormalities were found in six cases (67%). It should be noted that the shape of increased NT includes NT with a notch (notched NT) and NT without a notch (smooth NT). Among the 20 cases of notched NT, chromosomal abnormalities were observed in eight (40%), and cystic hygroma was observed in nine (45%). On the other hand, among the 38 cases of smooth NT, chromosomal abnormalities were observed in three (7.9%), but no cystic hygroma was observed. Our results confirm that increased NT does not always indicate a fetal abnormality. Whether NT thickness should be measured as a screening tool for fetal abnormalities remains controversial. However, increased NT may be detected by chance, because a maternal-fetal medical examination using ultrasonography is usually performed in Japan. It is therefore considered to be extremely important to establish a system in which cases are referred to obstetricians who are licensed clinical genetic specialists to obtain appropriate genetic counseling whenever increased NT is clinically observed.  相似文献   
43.
To assess the roles of the low molecular weight heparin (LMWH) on recurrent pregnancy loss (RPL). The relevant studies of all randomized controlled trials (RCTs) were retrieved, and the systematic evaluation was conducted. PubMed, Embase, and Cochrane library databases were searched by using keywords, including low-molecular-weight heparin or LMWH, and recurrent miscarriage or recurrent pregnancy loss in pregnant women from their earliest data to February 2020. Two investigators independently evaluated eligibility. Risk ratios (RRs) and their corresponding 95% confidence interval (CI) were determined. To pool the results, this meta-analysis was performed using random-effect model due to the high heterogeneity among these eight studies. A total of eight RCTs involving 1854 participants were included in the meta-analysis involving 963 patients with RPL who were prescribed LMWH (enoxaparin, tinzaparin, or dalteparin) alone and 891 patients who were treated with no LMWH interventions (placebo, folic acid or non-treatment) were compared. Pooled data from the remaining eight RCTs showed the differences between intervention groups and control groups. Compared with control groups, LMWH had significantly improved live births (RR,1.19; 95%CI, 1.03 to 1.38; P = 0.02), and reduced miscarriage rates (RR, 0.62; 95%CI, 0.43 to 0.91; P = 0.01). The study suggested that LMWH could improve the live births and reduce the miscarriage rates of RPL. Therefore, LMWH might be a good treatment choice for women with unexplained PRL.  相似文献   
44.
BackgroundComplex anorectal malformations (ARMs) are a group of rare congenital malformations involving numerous anomalies that require reconstruction and can affect sexuality, fertility, and pregnancy outcomes. Few cases of pregnancy in complex ARM patients have been reported.CasesWe report on 2 patients with ARMs who delivered 3 term infants, all by cesarean section with successful collaboration between pediatric urologists and obstetricians. Both patients fully recovered with no long-term consequences after experiencing maternal morbidities including urinary infections, clitoral abscesses, vaginal lacerations, extensive adhesive disease, bladder injury, and maternal hemorrhage.Summary and ConclusionIn managing pregnancies and deliveries in women with complex ARMs, coordination between obstetricians, pediatric urologists, and pediatric surgeons is crucial.  相似文献   
45.

Objective

To examine the clinical management of and placentas from pregnant women with hypothyroidism and obstetric history of recurrent stillbirth in order to identify possible etiologic mechanisms.

Methods

Two cases involving 26-year-old women with hypothyroidism and history of recurrent stillbirth are reported. Placentas from all of the women’s pregnancies were compared in order to identify histologic similarities.

Results

In both cases, multifocal hemorrhagic infarctions and abruptions were seen, indicating progressive uteroplacental ischemic damage leading to stillbirth. Thrombophilia, infection, and diabetes tests were all negative. With meticulous monitoring and normalization of thyroid function by end of first/early second trimester in subsequent pregnancies, there were live births and no evidence of infarction on placental histology.

Conclusion

The 2 reported cases raise the possibility of uteroplacental ischemia and placental abruption being mechanisms by which hypothyroidism can lead to stillbirth; they also highlight the potential of minimizing this risk via adequate levothyroxine treatment from early pregnancy.  相似文献   
46.
Objective: To report maternal and perinatal outcomes in obstetric patients with severe sepsis and septic shock. Methods: We performed a retrospective study of obstetric patients admitted to an intensive care unit (ICU) for severe sepsis/septic shock. Maternal clinical characteristics, hemodynamic profiles, laboratory findings, and perinatal outcomes were evaluated. Patients with severe sepsis (N = 20) and septic shock (N = 10) were compared using Fisher’s Exact and Mann–Whitney U tests. Results: Pyelonephritis was the most common etiology overall (37%) and acute respiratory distress syndrome (ARDS) was the most common organ injury in both severe sepsis (50%) and septic shock (80%). Liver dysfunction was present in cases with increased morbidity as a late finding and was the least frequent organ injury. Patients with septic shock had significantly higher rates of disseminated intravascular coagulation (DIC) (p = 0.01), altered mental status (p ≤ 0.001), total bilirubin >4?mg/dl (p = 0.04), failure in ≥3 organ systems (70% vs. 15%, p = 0.005), and maternal death (30% vs. 0%, p = 0.03). All patients with septic shock were delivered during hospitalization vs. 40% with severe sepsis. 71% of viable pregnancies required emergent cesarean delivery, and 50% of these for worsening respiratory function. Conclusions: ARDS is frequently found in critically ill obstetric patients with severe sepsis/septic shock and is associated with a high risk of emergent cesarean delivery.  相似文献   
47.
48.
49.
目的研究不同时机行硬膜外自控分娩镇痛对产程及母婴的影响。方法选择头胎的足月初产妇200例,随机均分为Ⅰ、Ⅱ、Ⅲ组和对照组(Ⅳ组)。Ⅰ组在宫口开至3~5 cm时行分娩镇痛,Ⅱ、Ⅲ组在宫口开至1 cm时行分娩镇痛,Ⅰ、Ⅱ组宫口开全停止镇痛,Ⅲ组宫口开至8 cm时停止镇痛。Ⅳ组为对照组,按产科常规处理。观察并记录各产程持续时间;记录宫口开至1 cm(T0)、3cm(T1)、8 cm(T2)、宫口开全时(T3)、胎儿娩出时(T4)的镇痛评分(VAS评分);记录分娩方式、缩宫素的使用情况;记录新生儿1、5 min Apgar评分、脐动脉血血气分析及新生儿神经行为(NBNA)1~3d的评分。结果第一产程潜伏期Ⅱ、Ⅲ组明显短于Ⅰ、Ⅳ组(P<0.01),活跃期Ⅰ、Ⅱ、Ⅲ组短于Ⅳ组(P<0.05),第二产程时间Ⅲ组短于Ⅰ、Ⅱ组(P<0.05);Ⅱ、Ⅲ组产妇的VAS评分明显低于Ⅳ组(P<0.05);Ⅲ、Ⅳ组产钳助产率明显低于Ⅰ、Ⅱ组(P<0.05);四组新生儿1、5 min Apgar评分、脐动脉血血气分析的各项指标差异均无统计学意义;新生儿出生后第1天NBNA评分(NBNA1评分)Ⅲ组明显高于Ⅰ、Ⅱ、Ⅳ组(P<0.05)。结论...  相似文献   
50.

Background

Complications from general anesthesia for cesarean delivery are a leading cause of anesthesia-related mortality. As a consequence, the overall use of general anesthesia in this setting is becoming less common. The impact and implications of this trend are considered in relation to a similar study performed at our institution 10 years ago.

Methods

The hospital database for all cesarean deliveries performed during six calendar years (January 1, 2000 through December 31, 2005) was reviewed. The medical records of all parturients who received general anesthesia were examined to collect personal details and data pertinent to the indications for cesarean delivery and general anesthesia, mode of airway management and associated anesthetic complications.

Results

Cesarean deliveries accounted for 23.65% to 31.51% of an annual total ranging from 8543 to 10091 deliveries. The percentage of cases performed under general anesthesia ranged from 0.5% to 1%. A perceived lack of time for neuraxial anesthesia accounted for more than half of the general anesthesia cases each year, with maternal factors accounting for 11.1% to 42.9%. Failures of neuraxial techniques accounted for less than 4% of the general anesthesia cases. There was only one case of difficult intubation and no anesthesia-related mortality was recorded.

Conclusion

The use of general anesthesia for cesarean delivery is low and declining. These trends may reflect the early and increasing use of neuraxial techniques, particularly in parturients with co-existing morbidities. A significant reduction in exposure of trainees to obstetric general anesthesia has been observed.  相似文献   
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号